In FS PBX, STIR/SHAKEN is handled entirely on the local system. There is a separate module for FS PBX that signs all outbound calls using your own certificate, which you’ll need to obtain from an authorized STIR/SHAKEN certificate provider.
Unlike some third-party services that rely on SIP REDIRECT messages and charge per dip, FS PBX processes everything locally. This allows you to sign an unlimited number of calls and assign Attestation A to all of them without incurring additional per-call fees.
